feat: cache masterfile on update

[lenisko]

Add ability to automatically save a cached version of MasterFile after successful fetch.

[jfberry]

An example of use would be to call Fetch at init and if fail, use Load with the previously cached file?
BTW load should also clear the cache

[lenisko]

If we plan to ship Golbat with some version of MasterFile in repo, we could fire Load first, then Fetch to try updating it and Watch to keep it updated in background. So when Fetch or Watch will work, after restart we will have more recent copy of MF in cache to Load. This way it won't fail anymore, but in the worst case (where both Fetch and Watch will fail) we will get old MF data.

If we don't provide any MF within a repo, we can still potentially get a fail on fresh Golbat copy - on Fetch since we NEED this to get PvP working. I would just handle it by panic log Place master-file.json in X since we can't fetch it automatically for you...

Thank you, @jfberry - fixed! Good eye!

[jfberry]

If we plan to ship Golbat with some version of MasterFile in repo, we could fire Load first, then Fetch to try updating it and Watch to keep it updated in background. So when Fetch or Watch will work, after restart we will have more recent copy of MF in cache to Load. This way it won't fail anymore, but in the worst case (where both Fetch and Watch will fail) we will get old MF data.

If we don't provide any MF within a repo, we can still potentially get a fail on fresh Golbat copy - on Fetch since we NEED this to get PvP working. I would just handle it by panic log Place master-file.json in X since we can't fetch it automatically for you...

Thank you, @jfberry - fixed! Good eye!

If you supply one with golbat, then startup should probably be:
Fetch - if fail - Load cache file - if fail - load distro file. Then call watch with the cache filename to have it write to that when it next succeeds to fetch.
This seems to cover all of the 'first install with network failure', 'restart with network failure' and 'restart normally' conditions? @Fabio1988

[jfberry]

Ultimately golbat should just decode the masterfile proto message and feed that to gohbem but that's for another day

[lenisko]

Sounds good to me. Let me know if everything we want is provided within a PR - I will merge and add a version tag.

[lenisko]

Ultimately golbat should just decode the masterfile proto message and feed that to gohbem but that's for another day

If we can provide this data, I can add a method to update internal struct. Here's everything from MF we need to handle calculations:

type PokemonData struct {
	// Initialized bool            `json:"-"`
	Pokemon     map[int]Pokemon `json:"pokemon"`
	Costumes    map[int]bool    `json:"costumes"`
}

type Pokemon struct {
	Attack                    int                  `json:"attack"`
	Defense                   int                  `json:"defense"`
	Stamina                   int                  `json:"stamina"`
	Little                    bool                 `json:"little,omitempty"`
	Evolutions                []Evolution          `json:"evolutions,omitempty"`
	TempEvolutions            map[int]PokemonStats `json:"temp_evolutions,omitempty"`
	CostumeOverrideEvolutions []int                `json:"costume_override_evos,omitempty"`
	Forms                     map[int]Form         `json:"forms"`
}

type Form struct {
	Attack                    int                  `json:"attack,omitempty"`
	Defense                   int                  `json:"defense,omitempty"`
	Stamina                   int                  `json:"stamina,omitempty"`
	Little                    bool                 `json:"little,omitempty"`
	Evolutions                []Evolution          `json:"evolutions,omitempty"`
	TempEvolutions            map[int]PokemonStats `json:"temp_evolutions,omitempty"`
	CostumeOverrideEvolutions []int                `json:"costume_override_evos,omitempty"`
}

type PokemonStats struct {
	Attack     int  `json:"attack,omitempty"`
	Defense    int  `json:"defense,omitempty"`
	Stamina    int  `json:"stamina,omitempty"`
	Unreleased bool `json:"unreleased,omitempty"`
}

type Evolution struct {
	Pokemon           int `json:"pokemon"`
	Form              int `json:"form,omitempty"`
	GenderRequirement int `json:"gender_requirement,omitempty"`
}